CaCO3 + 2HCl -> CaCl2 + CO2 + H2O
0,2...........0,4..............0,2.....0,2 (mol)
nCaCO3 = 0,2 (mol)
VCO2 = 4,48 (l)
m dung dịch HCl = \(\frac{0,4.36,5}{14,6\%}=100\left(g\right)\)
C%CaCl2 = \(\frac{111.0,2}{20+100-0,2.44}.100\%\approx19,96\%\)
a, CaCO3 + 2HCl---> CaCl2 + H2O + CO2
Ta có n CaCO3 = 20/100=0,2 =nCO2
VCO2=0,2.22,4=4,48 l
b, nHCl= 0,2.2=0,4
mddHCl= 0,4.36,5.100/14,6=100g
c, Ta có mdd thu đc= 20 + 100 - 0,2.44=111,2 g
=> C% dd thu đc=0,2.111.100/111,2=19,96%
Ta có
\(n_{CaCO_3}=0,2\left(mol\right)\)
PTHH
\(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)
Theo PTHH có
\(n_{CO_2}=n_{CaCO_3}=0,2\left(mol\right)\Rightarrow V_{CO_2}=4,48\left(l\right)\)
\(n_{HCl}=2n_{CaCO_3}=0,4\left(mol\right)\Rightarrow m_{HCl}=14,6\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\frac{14,6}{14,6}.100\%=100\left(g\right)\)
\(n_{CaCl_2}=n_{CaCO_3}=0,2\left(mol\right)\Rightarrow m_{CaCl_2}=22,2\left(g\right)\)
\(m_{ddsaupu}=20+100=120\left(g\right)\)
\(\Rightarrow C\%\left(CaCl_2\right)=\frac{22,2}{120}.100\%=18,5\%\)